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    SN2012ab: a peculiar Type IIn supernova with aspherical circumstellar material

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    Author
    Bilinski, Christopher
    SMITH, NATHAN
    Williams, G Grant
    Smith, Paul
    Zheng, WeiKang
    Graham, Melissa L
    Mauerhan, Jon C
    Andrews, Jennifer E
    Filippenko, Alexei V
    Akerlof, Carl
    Chatzopoulos, E
    Hoffman, Jennifer L
    Huk, Leah
    Leonard, Douglas C
    Marion, G H
    Milne, P. A. cc
    Quimby, Robert M
    Silverman, Jeffrey M
    Vinkó, Jozsef
    Wheeler, J Craig
    Yuan, Fang
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-03-21
    Keywords
    supernovae: individual: Type IIn
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Christopher Bilinski, Nathan Smith, G Grant Williams, Paul Smith, WeiKang Zheng, Melissa L Graham, Jon C Mauerhan, Jennifer E Andrews, Alexei V Filippenko, Carl Akerlof, E Chatzopoulos, Jennifer L Hoffman, Leah Huk, Douglas C Leonard, G H Marion, Peter Milne, Robert M Quimby, Jeffrey M Silverman, Jozsef Vinkó, J Craig Wheeler, Fang Yuan; SN2012ab: a peculiar Type IIn supernova with aspherical circumstellar material, Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 1, 21 March 2018, Pages 1104–1120, https://doi.org/10.1093/mnras/stx3214
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present photometry, spectra, and spectropolarimetry of supernova (SN) 2012ab, mostly obtained over the course of similar to 300 d after discovery. SN 2012ab was a Type IIn (SN IIn) event discovered near the nucleus of spiral galaxy 2MASXJ12224762+0536247. While its light curve resembles that of SN 1998S, its spectral evolution does not. We see indications of CSM interaction in the strong intermediate-width emission features, the high luminosity (peak at absolute magnitude M = -19.5), and the lack of broad absorption features in the spectrum. The Ha emission undergoes a peculiar transition. At early times it shows a broad blue emission wing out to -14000 km s(-1) and a truncated red wing. Then at late times (> 100 d) it shows a truncated blue wing and a very broad red emission wing out to roughly +20 000 km s(-1). This late-time broad red wing probably arises in the reverse shock. Spectra also show an asymmetric intermediate-width H alpha component with stronger emission on the red side at late times. The evolution of the asymmetric profiles requires a density structure in the distant CSM that is highly aspherical. Our spectropolarimetric data also suggest asphericity with a strong continuum polarization of similar to 1-3 per cent and depolarization in the Ha line, indicating asphericity in the CSM at a level comparable to that in other SNe IIn. We estimate a mass-loss rate of M = 0.050 M-circle dot yr(-1) for v(pre) = 100 km s(-1) extending back at least 75 yr prior to the SN. The strong departure from axisymmetry in the CSM of SN 2012ab may suggest that the progenitor was an eccentric binary system undergoing eruptive mass loss.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stx3214
    Version
    Final published version
    Sponsors
    NSF [AST-1210599, AST-1312221, AST-1515559, AST-1211916, AST-1109881, PhY-0801007, AST-1009571, AST-1210311]; Research Corporation for Science Advancement; NSF Astronomy and Astrophysics Postdoctoral Fellowship [AST-1302771]; TABASGO Foundation; Gary and Cynthia Bengier; Christopher R. Redlich Fund; Richard & Rhoda Goldman Fund; Miller Institute for Basic Research in Science (U.C. Berkeley); NASA [NNX08AV63G]; Australian Research Council; University of New South Wales; University of Texas; University of Michigan; W.M. Keck Foundation
    Additional Links
    https://academic.oup.com/mnras/article/475/1/1104/4750785
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stx3214
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